redhat install kvm

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1. Install the following packages for setting up  guest hosts using KVM virtualization .
                    # yum install  virt-install  virsh  libvirt  kvm                       # yum install kvm python-virtinst libvirt libvirt-python virt-manager                       # yum install virt-viewer libguestfs-tools
2.   Check whether the following modules are loaded . If not , load it manually using insmod.
# modinfo kvmfilename:       /lib/modules/2.6.32-220.el6.x86_64/kernel/arch/x86/kvm/kvm.kolicense:        GPLauthor:         Qumranetsrcversion:     E0EC656A576974AAE72808Ddepends:vermagic:       2.6.32-220.el6.x86_64 SMP mod_unload modversionsparm:           oos_shadow:boolparm:           ignore_msrs:boolparm:           allow_unsafe_assigned_interrupts:Enable device assignment on platforms without interrupt remapping support. (bool)------------# modinfo kvm_intelfilename:       /lib/modules/2.6.32-220.el6.x86_64/kernel/arch/x86/kvm/kvm-intel.kolicense:        GPLauthor:         Qumranetsrcversion:     0B88774FBBF6ECB64244D3Adepends:        kvmvermagic:       2.6.32-220.el6.x86_64 SMP mod_unload modversionsparm:           bypass_guest_pf:boolparm:           vpid:boolparm:           flexpriority:boolparm:           ept:boolparm:           unrestricted_guest:boolparm:           emulate_invalid_guest_state:boolparm:           yield_on_hlt:boolparm:           ple_gap:intparm:           ple_window:int  3.  Restart libvirtd service               # /etc/init.d/libvirtd restart               Stopping libvirtd daemon:                                  [FAILED]               Starting libvirtd daemon:
                                              Setting Up Networking
1.   Create a new br0 network device of TYPE Bridge using system-config-network command or  
      create it manually as shown below. Assign IP Address and other network configuration details
      based on your requirement.  
    .
        # vim /etc/sysconfig/network-scripts/ifcfg-br0           DEVICE="br0"           NM_CONTROLLED="no"          ONBOOT=yes          TYPE=Bridge          BOOTPROTO=none          IPADDR=192.168.2.148          PREFIX=26          GATEWAY=192.168.2.130          NAME="System br0"
2.   Modify the original network configuration file (e.g /etc/sysconfig/network-scripts/ifcfg-eth0 )     
     and comment out BOOTPROTO , IPADDR  , PREFIX and GATEWAY parameters . Add
      the following network parameter and restart network service .                                       
                                                          BRIDGE=br0
     So , the final eth0 network interface file will be as follows
       $ cat /etc/sysconfig/network-scripts/ifcfg-eth0          DEVICE=eth0
          NM_CONTROLLED=no          BRIDGE=br0          ONBOOT=yes          TYPE=Ethernet          #BOOTPROTO=static          #IPADDR=192.168.2.148          #NETMASK=255.255.255.192            USERCTL=no          #GATEWAY=192.168.2.130
3. Restart network service
        #/etc/init.d/network restart
If all went fine your network configuration will be as follows:
# ifconfig
eth0     Link encap:Ethernet  HWaddr 44:1E:A1:55:B0:B0
          UP BROADCAST RUNNING  MULTICAST  MTU:1500  Metric:1
          RX packets:724970 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8032 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:239225199 (228.1 MiB)  TX bytes:1348488 (1.2 MiB)
br0       Link encap:Ethernet  HWaddr 44:1E:A1:55:B0:B0
          inet addr:192.168.2.147  Bcast:192.168.2.191  Mask:255.255.255.192
          inet6 addr: fe80::461e:a1ff:fe55:b0b0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:30 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3898 (3.8 KiB)  TX bytes:3196 (3.1 KiB)
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2794116 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2794116 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:260264756 (248.2 MiB)  TX bytes:260264756 (248.2 MiB)
                                 Creating the Guest Hosts
There are two tools available for creating  guest hosts . One is virt-manager tool which has a graphical interface and the other is virt-install tool which has a text interface . We will be using virt-install tool to setup guest hosts.
For our case , we will be creating a virtual hosts with 3 GB of RAM , 3 no of CPUs  and with a hard disk space of 20G . The command will be as follows:
  # virt-install --network bridge=br0 \
                      --name  vm-dbase   \
                      --ram=3072  \
                      --vcpus=3  \
                      --disk path=/var/lib/libvirt/images/vm1-mysql.img,size=20  \
                     --graphics none   \
                     --location=http://192.168.4.139/rhelisos  \
                     --extra-args="console=tty0 console=ttyS0,115200"  \
                     --os-type=linux  \
                     --os-variant=rhel6                 
Little description is as follows:
       --vcpus= Number of virtual cpus to configure for the guest.
       --location=An HTTP server location containing an installable distribution image
       --disk=Specifies media to use as storage for the guest, with various options including size of disk
       --name=Name of the new guest virtual machine instance.     
Press Enter and here you go , creation of virtual host will get initiated  . Follow the on-screen instructions for setting up the OS . These are the standard instructions we need to pass through while installing Linux . Once you are done providing all the parameters , a minimal OS installation will be done. The Guest host will be rebooted after installation is complete and you will be provided with a login prompt to login into the guest operating system .